ANNUAL REFRESHER TEACHERS TRAINING JULY 2011

ACTION PLAN DA M ODEL H IGH S CHOOL PH:IV PRESENTED BY : Ms TABASSUM NASEER

TRANSPIRATION

CONTENTS  Transpiration  Transpiration pull  Process of transpiration in plants (Experiment)  Stomata (structure & function)  Factors affecting the rate of transpiration  Hazards

TRANSPIRATION Objectives 21 st Century skills Bloom’s Taxonomy 21 st Century Approaches

Remembering Understanding Applying Analyzing Evaluating Creating B LOOM ’ S T AXONOMY

LONG TERM GOAL Using Bloom’s Taxonomy to develop higher order thinking in students To relate 21 st century approaches with 21 st century skills in order to promote student centered learning

High Order Thinking Create HIGH ORDER THINKING ANALYZINGCREATEEVALUATING Short Term Goals

S HORT TERM GOAL Analysis By the end of this topic students will be able to analyze the process of transpiration and prepare a report.

S HORT T ERM G OALS (C ONT ) By the end of this lesson students will be able to Compare the transpiration with other process and make a conclusion Evaluation

S HORT T ERM G OALS (C ONT )  Creation By the end of this lesson students will be able to set up a project to show the process of transpiration

BRAIN STORMING INTRODUCTION Monday Understand Explain Experiment Examples Tuesday Apply Outline Analyze compare Wednesday Evaluate Class performance Competition Database Thursday Display Feed back QUIZ Friday Timeline (Dimensions of Bloom’s Taxonomy)

I NSTRUCTIONAL S TRATEGIES TOPICTRANSPIRATION 21 st Century Approach Giving direction, listening & speaking skills Techniques/ Modes Report, speech, project & presentation quiz.quiz. 21 st Century SkillsCommunication skills, creativity, self direction & media literacy

 To understand the process of transpiration.  To know the factors that affect the process of transpiration.  To understand the importance of transpiration to plants O BJECTIVES :

W HAT IS TRANSPIRATION ?. “The loss of water vapor from the plants, especially through stomata is called transpiration”. Transpiration may also refer to sweatingsweating

W HAT HAPPENS DURING TRANSPIRATION ?

IMPORTANCE OFTRANSPIRATION:  Creates transpiration pull for transport  Supplies water for photosynthesis  Transports minerals from soil to all parts of a plant  Cools the surface of the leaves (due to the evaporation of water)  Keeps the cells turgid; hence, maintains their shape

ACTIVITY  APPARATUS: Petroleum jelly Water Beaker Oil Bell jar/ polythene bag

METHOD Take a potted plant Cover it with the polythene bag Put the set up under the sunlight Observe what happens After two hours inside the surface of the Bell jar/ polythene bag will be examined After two hours small drops of water can be seen and these water vapours comes out from the leaves of the plant

STOMATA Leaf surfaces are dotted with openings which are collectively called stomatastomata The stoma (singular of stomata) is bordered by guard cells that open and close the pore

STRUCTURE OF STOMATA  The two bean shaped cell around the stomata are called guard cell.  Change in the size of a stoma is caused by changes in the shape of guard cell.  When stoma is open, CO 2 & O 2 move from air in to the leaf& from leaf in to the air.H 2 O also escapes through stoma.

How do the guard cells react to the availability of water? Dry – guard cells CLOSE lots of H 2 O – guard cells OPEN Function of Guard Cells

VIDEO

1. Transpiration: The process by which plants cool their leaves by the evaporation of water from the leaves' surfaces or Transpiration is the loss of water from the plant to the atmosphere in the form of vapor. 2. Stomata: The pore like openings on the bottom surface of leaves through which water and gases pass as they leave the plant. Leaf transpiration occurs through stomata, and can be thought of as a necessary "cost" associated with the opening of the stomata to allow the diffusion of carbon dioxide gas from the air for photosynthesis. Transpiration also cools plants and enables mass flow of mineral nutrients and water from roots to shoots. OVERVIEW:

3. Guard Cells: The guard cells open and close the stomata as needed. They open the stomata when temperatures are high. They close the stomata when the plant is water stressed and when the temperature drops. 4. The amount of water that plants transpire varies greatly geographically and over time. There are a number of factors that determine transpiration rates:water Temperature: humidity. Wind. Soil water

REFERENCES : Link: *Select Transpiration (5th from the bottom) Read more: environmental/articles/64818.aspx#ixzz1Q3ltXS4R IMAGE CREDIT: All images are courtesy of Wikimedia &Google What 21st Century Technology was used in this unit Video Image File(s) Audio File(s) Student Response System Link: *Select Transpiration (5th from the bottom) Read more: environmental/articles/64818.aspx#ixzz1Q3ltXS4R IMAGE CREDIT: All images are courtesy of Wikimedia &Google What 21st Century Technology was used in this unit Video Image File(s) Audio File(s) Student Response System

QUIZ

DA MODEL HIGH SCHOOL PH: IV Student Activity Pre-Assessment CLASS: VII TOPIC: Transpiration NAME: _________________ SEC: __________________ 1. Complete the blanks in the sentence below. A plant absorbs water through its ______________, and looses water through its _______________. 2. What are the functions of leaves? A.capture light B.exchange gases C.provide a site for photosynthesis D.some leaves store food and water E.some form new plants and provide support 3. Plants lose water from the leaves into the air. This process is called____________. 4. Transpiration is done by a force which is exerted by the plant on the water and this force is called __________. 5. The two bean shaped cell around the stomata are called__________. 6.__________ permits gaseous exchange with the atmosphere. 7. Transpiration may also refer to ____________. 8. ____________ is a process similar to evaporation % water is kept within the plant & __________is lost through transpiration. 10. ______________ closes the stomata when the plant is water stressed and when the temperature drops. THE END